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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Firm Commitments As of September 30, 2024, United had firm commitments to purchase aircraft from The Boeing Company ("Boeing") and Airbus S.A.S. ("Airbus") as presented in the table below:
Contractual Aircraft DeliveriesExpected Aircraft Deliveries (b)
Aircraft TypeNumber of Firm
 Commitments (a)		Last Three Months
of 2024		2025After 2025Last Three Months
of 2024		2025After 2025
787150 8 18 124 3 11 136 
737 MAX 818 18 — — 2 16 — 
737 MAX 9141 31 40 70 3 28 110 
737 MAX 10167 — — 167 — — 167 
A321neo115 14 23 78 14 23 78 
A321XLR50 — — 50 — — 50 
A35045 — — 45 — — 45 
(a) United also has options and purchase rights for additional aircraft.
(b) Expected aircraft deliveries reflect adjustments to contractual delivery schedules as communicated by Boeing and Airbus, as otherwise agreed between the relevant parties, or as estimated by United. However, aircraft deliveries are subject to a number of variables, as further described in Part I, Item 1A. Risk Factors of the 2023 Form 10-K, and we cannot guarantee delivery of any particular aircraft at any specific time notwithstanding firm purchase commitments.
Schedule of Commitments
The table below summarizes United's firm commitments as of September 30, 2024, which include aircraft and related spare engines, aircraft improvements and non-aircraft capital commitments. Aircraft commitments are based on contractual scheduled aircraft deliveries.
(in billions)
Last three months of 2024$4.1 
20257.2 
20265.6 
20274.8 
20287.3 
After 202827.8 
$56.8 
Schedule of Estimated Future payments of Contractual Obligation Based on these assumptions as of September 30, 2024, our estimated future payments through the end of the terms of our CPAs are presented in the table below:
(in billions)
Last three months of 2024$0.7 
20252.7 
20262.5 
20271.9 
20281.6 
After 20284.7 
$14.1